For most folks under the age of 35, the name Trans Am conjures a hopped-up Firebird with a screaming chicken decal on the hood or maybe the image of Burt Reynolds and Sally Field evading the cops in the deep South. But for some, Trans-Am means a road-race series with small-displacement Camaros, Firebirds, Mustangs, Cougars, Cudas, Challengers, and Javelins battling it out in the purest ponycar competition that this country had to offer. Thirty years ago, Dan Gurney, Sam Posey, George Follmer, Mark Donohue, and Swede Savage duked it out fender-to-fender on the straights and corners of America’s road courses—in machines that were closer to real street cars than even the NASCAR rides of the time. From Watkins Glen to Elkhart Lake, Trans-Am cars not only went like stink, but…